hogan



(No Model.) 2 Sheets- Sheet 1; J. J. HOGAN.

v INTERNAL FEED WATER HEATER. N0. 565,986. Patented Aug. 18, 1896.

(No Model.) 2 SheensSheet 2.

J. J. HOGAN. INTERNAL FEED WATER HEATER.

9/? 2/6 wi'ar.

6H 9 0O 1 8 1 w Z A l d w Y J ,z n /d l\% w w H II Dam mun H uh hsT 3 mi f m a 91W mm I um w u 0% ,aam lln'irnn hinries Persist fiss on...

JOHN J. HOGAN, or MlDDLET( WN,-N'EW rose.

lNTERNAl. seeneletes secrete.

SPECIFICATIQN forming part of"? Letters Patent No. 565,986, dated August 18, 1896.

Application filed September 153, i895. Serial No. 662/l07. (No model i Be it known that 1, JOHN J. HOGAN, e citizeii of the United States, residing at Middleto'wn, Orange county, New York State, have invented certain new and useful Improve moms in Internal Feed Water Inductors, fully described and represented in the fcllovw ingspecificaticn and the accompanying drewings', forming apart of thesanie.

The object of this invention is to furnish a more ei'ficient and simple means of heating the feed-waiter delivered to e tubular steamboiler, and preferably to deliver the feedweter into the descending current of the boiler, so as to be heated by the waste heat of the boiler fluid before it enters the rising current, in contact with the hotter surfaces.

The invention is especially applicable to boilers hevinge horizontal steam-drum the top and a. water-drum arranged at a lower level and connected with the steam-drum by ascending and descending water-tubes.

The invention consists, primarily, of a feed water-heater shell immersed in and heated by the moving circulation-current of the boiler.

Such circulation-current is most eiiect-ively maintained by connecting a stemnnnd-water drum at the top of the boiler ,wit-h a waterdruul at the bottom by means of seconding and descending Wetentubes; and the invention consists, partly, in the combination, with the heater-shell extended Within the steam-ond-water drum below the waterline, of a series of discharge-pipes extended from the top of the shell to the mouths of the descending pipes to mingle the feed-water with the current of boiler fluid descending therein.

The invention also includes other details of construction, as hereinafter set forth.

= The invention will be understood by referonce to the annexed drawings, in which Figure 1 an elevation of the drums and tubes in. such 1 water-tube boiler w' h the stezmmlrum in section. 2 is n vertical section upon line "2 2 in Fig. 1. Fig. 3 is a longitudinal section of the heater, and Fig. is across section of the some. Figs. 3 end Al are drawn upon a larger scale than Fig. 2'.

A designates the .s'teani-drum, and B. B

"water-drums arranged below the same at opposite sides of a grate O. The ascending tubes D connect the water-drumswith the bottom of the steam-drum, and the descend-- ing' tubes E connect the water-drums with the sidesof the steam-drum adjacent to the water-line. F is n inudklruin provided with a blow -oil G and connected with the bottoms of the er tor-drums by pipes having cocks H.

The water-heater consists of a tubular shell 7:, closed cttlie ends by caps j. The boiler when in operation is tilled 'i'th wa t-er up above the tops of the descending tubes E, and the drum A therefore serves as a steam-endwnter drum. The shell is shown immersed in the boiler fluid just below the water-line w and one of the caps connected with the teed-water pipe 7.2, which is extended through the head A of the stemn-drum. he cont-set of the shell with the boiler fluid heats it to a high ten1pernture, end the feed-water within such shell is thus heated very efiiectively.

The other is connected by pipcZ and cock 1% with the mud-drum F. l

A heating-pipe n is connected with the feeduater pipe I; and extended "within the shell close to its bottom nearly to the opposite cop.

A series of small outlet-apertures is formed. in I the top of the shell, their combined area. being no g renter than that of the feed-water pipe, twelve of such outlets, a quarter-inch dieineter enclnbein g shown to cooperate with a. oneinch feedomter pipe. As the water delivered by the pipe within the shell is unable to escape through the aperturcsnearest to the mouth. of such pipe, it is forced toward the apertures at the farther end of the shelha-nd is thus brought into contact with 'a'le-rge part of the shells surface before it is discharged into the boiler fluid. By extending the heating-pipe '11. through the length of the shell. the cold water flowing through such heetingpipe is warmed before it enters the shell by conduction from the water within the shelhwhich is already partially heated by the heat conducted through the shell itself. The heat is thus conducted to the water most effecti ly and thoroughly before the water is discha; *ed from the heater.

A series of discharge-pipes 0 is projected from the apertures in the top of the shellnnd bent downwardly to extend into the mouths of the descending tubes The water rises :3) formed of wrought-metal in the ascending tubes D, owing to their superior heat, and, after it has discharged its steam into the drum A, descends to the water-drums B through the tubes E, and in its passage from the mouths of the tubes D to the mouths of the tubes E the highly-heated current flows over the water-heater, which is arranged within the steam drum between the months of the said pipes. Two such waterhcaters are shown in Fig. 1 arranged at opposite sides of the center line and connected with the feed-pipe by'branch pipes is. I sometimes extend the mouths of the watertubes 1) upward through the water above the water-linen; but the-heated fluid in either construction flows around the shell of the water-heater on its passage to the descendin g tubes E. As

vails in the steam-drum, steam is liable to be 7 generated within the shell of thewater-heater, and I therefore extend a vent-pipe g from the top of the water-heater toa point abovethe water-line to discharge any steam that may be generated therein. As the temperature of the feed-water is greatly raised within the ingoi the sediment from the heater the out let-pipe G from the mud -drum is slightly opened to diminish the pressure therein, thus inducing a current of steam into the heater shell '1; through the vent-pipe g, which forces the entire contents of theheater through the pipe L into the mud-drum.

. \Vithout the steam vent-pipe q a watercurrent would be induced within the heater (when thus connected with the mud-drum) through the water-pipes 0; but the action of the water-current would not be so rapid as that of the steam and would not tend to scour out the interior of the water-heater so effectively. The vent pipe q also furnishes a means of scouring out the mud-drum with steam, when required, as the entire contents of the mud-drum would be blown out rapidly by the steam operating through the pipe q whenever the outlet-pipe G from the muddrum is fully opened.

The boiler-settings are not shown in the drawings, as'they form no part of the pres ent invention, which relates solely to the construction of the water-heater and its connectionsand its arrangement Within the steamdrum, where it is exposed to the heated steam and water.

The shell of the heater is shown (see Rig. pipe with caps screwed upon its ends; but the heater may be formed in one piece, of castdron, if pre ferred, and the pipe 9.2 inserted through one of the ends. The pipe n is placed within the lower side of the heater-shell i to permit the free passage of the Water to the outlet-pipes a very high temperature pre- 0, but maybe placed in the center of the shell without departing from my invention.

The outlet-pipes o are shown projected from the top of the shell, bu" may be projected from the side, if preferred, and where aheatcr is used having the constructive features which I have described in a steam-drum having no descending tubesE the water may be discharged from the outlets of the heater-shell directly into the boiler fluid, the outlets in such case being made. very small to diffuse the fecd-waterin a sort of spray within the boiler fluid.

By mingling the feed-water first with the descending current of boiler fluid the water is heated by the waste heat of the fluid and is thus raised within a few degrees of the boiler temperature without. diminishing the heat of the ascending fluid.

In one important respect my invention differs from other water-heaters, in its arrangement within the moving circulation-current of the boiler between the mouths of the ascending and descending water tubes, which produce such a moving current in the upper drum where the steam is disengaged from the water.

One form of water-tube boiler is shown in the drawings to illustrate my invention; but it is obvious that. the arrangement of the tubes in relation to the steam-drum is immaterial, provided-thc-drnnr-is connected with ascending and descending water-tubes which produce a circulation or moving-water current therein. The insertion of a water-heater shell within the drum below the water-line secures, under such conditions, the utmost possible rapidity in. the conduction of heat to the feed-water, while the moving current of water carries the feed-water, when mingled therewith, into the cooler parts of the boiler, where it is least liable to. injure the heated boiler plates or tubes.

-Having thus set forth thenature of my invention, what I claim herein is-- 1. In a tubular steam-boiler, a steam-drum having ascending and descending watertubes connected therewith, a tubular feed- Water heater extended within the drum below the water-line, a feed-water pipe delivering water within such heater, and a series of discharge-pipes extended from the top of the heater tomingle the heated feed-water with the boiler fluid, substantially as herein set forth.

2. In a tubular steam-boiler, a steam-drum having ascending and descending watertubes connected therewith, a tubular feedwater heater extended Wit-hill the drum below the Water-line, a feed-Water pipe delivering water within such heater, a. series of discharge-pipes for mingling the feed-water with the boiler fluid, and a vent-pipe projected from the top of the heater above the water- .line Within the steam-drum, as and for the purpose set forth.

3. in a tubular steam-boiler, a steam-drum,

' delivering water within such heater and minute discharge-pipes extended fromthe heater into the mouths of the descending water-tubes to deliver the feed-water therein, substantially as herein set'forth.

4. A tubular steam-boiler having a steamdrum with a water-drum arrangedat a lower level and connected therewith by ascending and descending water-tubes, a mud-drum connected with such water-drum, a feedwater heater having a tubular shell extended within the drum below the water-line, a feedwater pipe delivering water within such heater, and a series of discharge-pipes for mingling'the heated water with the boiler fluid, and a connection from the shell of the heater to the mud-drum to discharge the mud therefrom, substantially as herein set forth.

5. A tubular steam-boiler having a steamdrum with a water-heater'a-rranged at a lower level and connected therewith by ascending and descending water-tubes, a mud-drum connected with such water-drum and provided with an outlet-pipe G, a feed-water heater having a tubular shell extended within i the steam-drum below the water-line, a feedwater pipe delivering water within such heater, and discharge-pipes for mingling the. heated feed-water with the boiler fluid, a connection from the shell of the heater to the mud-drum to discharge the mud therefrom, and avent-pipe, as q, projected from the heater abote the water-line within the steamdrumto admit steam for blowing on the waterheater and the mud-drum, substantially as herein set forth. I

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

J OHN J. HOGAX. Witnesses:

.L. LEE,

Enw. F. KINSEY. 

